The studies included in a meta-analysis
A) usually consist of the complete target population.
B) may be biased because of the inability to identify unpublished research.
C) usually consist of a random sample of the target population.
D) are called "file drawer" studies.

Question

Quizplus · Accepted Answer

Meta-analyses can be biased due to publication bias, where studies with significant results are more likely to be published, while those with null or negative results remain unpublished and inaccessible.

The Studies Included in a Meta-Analysis